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NCP5030

ON Semiconductor
Part Number NCP5030
Manufacturer ON Semiconductor
Description Buck Boost Converter
Published Dec 21, 2006
Detailed Description NCP5030 Buck-Boost Converter to Drive a Single LED from 1 Li-Ion or 3 Alkaline Batteries The NCP5030 is a fixed frequen...
Datasheet PDF File NCP5030 PDF File

NCP5030
NCP5030

Overview
NCP5030 Buck-Boost Converter to Drive a Single LED from 1 Li-Ion or 3 Alkaline Batteries The NCP5030 is a fixed frequency PWM buck−boost converter optimized for constant current applications such as driving high−powered white LED.
The buck−boost is implemented in an H−bridge topology and has an adaptive architecture where it operates in one of three modes: boost, buck−boost, or buck depending on the input and output voltage condition.
This device has been designed with high−efficiency for use in portable applications and is capable of driving in DC up to 900 mA into a high power LED for flashlight / torch applications.
To protect the device cycle−by−cycle current limiting and a thermal shutdown circuit have been incorporated as well as output over−voltage protection.
The 700 kHz switching frequency allows the use of a low value 4.
7 mH and ceramic capacitors.
The NCP5030 is housed in a low profile space efficient 3x4 mm thermally enhanced WDFN.
Features • Efficiency: 87% at 500 mA and 3.
3 V VIN • Internal Synchronous Rectifier, No Schottky Diodes • Adjustable Switching Limit Current to Optimize inductor size • 0.
3 mA Shut−down Control with “True−Cut off” • Input Voltage Range from 2.
7 V to 5.
5 V • 200 mV Feedback Voltage • Output Over−voltage and Thermal Shut Down Protection Typical Applications • Portable Flashlight / Torch Lights Vin 1 Cell Li−Ion 2.
7 to 5.
5 Cin 1 mF C2 10 mF Cin 39 k R1 ENABLE PCA CTRL VIN PVIN LX1 LX1 LX2 4.
7 mH L1 VOUT VS NCP5030 C3 22 mF D1 Cout AGND COMP FB PGND L1: TDK RLF7030T−4R7M3R4 C1: 1 mF 6.
3 V X5R C2: 10 mF 3.
6 V 0805 TDK: C2012X5R0J106MT C3: 22 mF 6.
3 V X5R TDK: C2012X5R0J226MTJ C4 22 pF R2 100 k C5 330 pF R3 220 m RSENSE Figure 1.
Typical Application Circuit http://onsemi.
com MARKING 12 DIAGRAM 1 1 WDFN12 3x4 MT SUFFIX CASE 506AY 5030 AYWWG G 5030 = Specific Device Code A = Assembly Location Y = Year WW = Work Week G = Pb−Free Package (Note: Microdot may be in either location) PIN CONNECTIONS FB 1 COMP CTRL ...


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